SKF轴承样本

Rolling Element Bearings

Figure 11-1, Mechanical Engineering Design, Juvinall& Marshek

Bearing Terminology

•Tapered Bore:Seat the bearing onto a tapered shaft or to accommodate

a tapered sleeve which can be used to fix a bearing to a shaft.

•Shields or Seals:Between the inner and outer rings to capture lubricating grease around the balls and prevent intrusion of

contaminants.( Z-shield ,RS-seal)-eg-61814-2RS1-two contact seals

(NRB)

•Self Aligning:The inner ring can pivot so that the bore of the inner ring is not aligned with that of the outer ring, this accommodates shafts

which are not perfectly aligned (concentric) with the outer ring of the

bearing.

Bearing Terminology

•Pure Radial and Pure Axial Loads:This indicates a bearing’s ability to sustain each of these kinds of loads in isolation.

•Combined Loads:Ability to sustain a radial and an axial load at the same time.

•Moment Load:This indicates a bearing’s ability to support a moment at right angles to the longitudinal shaft axis.

•High Running Accuracy and High Stiffness: Some applications require a bearing which maintains the center of rotation of the shaft with extreme accuracy even when large loads are applied.

Bearing Terminology

•Locating:If the inner ring of a bearing is axially “locked” to the shaft and the outer ring is axially “locked” to the housing, then the bearing is said to be locating since it prevents the shaft from moving axially w.r.t.

the housing.

•Non-Locating:If either the inner or outer ring is not axially locked, the bearing cannot prevent the axial movement of the shaft.

•Axial Displacement:In some bearings, the inner and outer races are free to move axially w.r.t. each other. This kind of bearing cannot be used in a locating arrangement.

Bearing Terminology

Fig 122-124, Ball and

Roller Bearings

Angle Of Contact

•Figure 122a,b

Bearing Classification Bearing Classification

Bearing Types & Loads

Deep Groove Ball Bearing Pictures Courtesy of SKF General Catalogue, and SKF Rolling Bearings in Industrial Gearboxes

Deep Groove Ball Bearings

Max axial load =.25*C o --.5*C0

Bearing Types & Loads

Cylindrical Roller Bearing Pictures Courtesy of SKF General Catalogue, and SKF Rolling Bearings in Industrial Gearboxes

Cylindrical Roller Bearing

Axial load is governed by load capability

Of sliding contact on flange –function of

lubricant, operating temp. and heat

removal.